If the temperature changes in a chemical reaction, what has occurred?
Energy was transferred.
There was no energy transfer.
Energy was destroyed.
Energy was created.
Answer:
Energy was transferred
Explanation:
If the temperature changed, energy must have been added or lost, but not created. Energy can't be created or destroyed.
giveaway!! 2 more coming up.
hope you get it ! <3
Answer:
k
Explanation:
Thank you for hosting <3
a flask that weighs 450g is filled with 145ml of benzene. the weight of the flask and benzene is found to be 754g. from this information, calculate the density of the benzene.
as water cruise to a temperature of zero degrees Celsius and form ice water molecules tend to
A. move faster apart
B. vibrate rapidly
C. flow more randomly
D. gradually expand
Answer:
B. vibrate rapidly
Explanation:
Mark above answer as BRILLIANT
Scientists Hydia, Christian, and Trynatie took 100 frogs. They kept 50 of the frogs at 35 degrees C. They kept 50 of the frogs at 25 degrees C. Then they measured how fast each frog's heart beat. What was changed or different BEFORE the experiment began?
Answer: Temperature was kept as an independent variable to observe the changes in the heart beat.
Explanation:
Independent variable can be defined as the variable which can be changed to induce change in an dependent variable which is the outcome of the experiment.
According to the given situation, the temperature in which the frogs were kept changed to observe the changes in the rate of heart functioning. So, the temperature is the independent variable which changed before the experiment began.
All objects contain matter which statement is true? A. Matter is usually measured in milliliters B. The shape of an object is what gives it matter. C. Matter is a measurement of how big an object is. D. As matter is added to an object, its weight increases
Answer:
D. As matter is added to an object, its weight increases
Explanation:
WILL GIVE BRAINLYEST and 20 points!!!!!!!
explain that atoms of elements combine to make compounds
explain why there are many, but limited, combinations of elements to make compounds
demonstrate with atomic models how atoms can combine in many ways
Answer:
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.
Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.
Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.
The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Answer:
give him brainlyest my gye
Explanation:
Where would we find yellow bone marrow?
Answer:
Yellow bone marrow can be found in the long bones of the human body one such bone being the femur the yellow bone marrow contains certain stem cells which produce cartilage, fat and bone.
Explanation:
Answer:
Yellow bone marrow can be found within the medullary cavity. You see, the anatomy of a compact bone consists of blood vessels, cartilage, red bone marrow, etc. Within the bone there is spongy bone which holds the medullary cavity, and within this cavity there is yellow bone marrow.
well its an easy one but it hard for me so plz
Answer:
need more so we can answer
Explanation:
On a hot day, the wood gate on the side of my house gets stuck and I have to push very hard to get it open and shut. Describe *on the molecular level* why this is happening. Use these terms in your answer: kinetic energy, molecules
Answer:
Well rust just because the rain and wind sun whatever its meatal it stayed outside too long!
Explanation:
I really dont kno but i hope im right
Plz I need help!!!!!!!!!!!
Answer:
Your help from me is a good luck! :)
Explanation:
Lol sorry I don't know the answer and don't want to tell you something wrong. Good luck though. Have a great day!
How do the electromagnetic spectrum and visible light connect?
Explanation:
The visible light is a part of the electromagnetic spectrum with the range of 400nm to 700nm.
Visible light is made up of all the colors we can perceive.
The electromagnetic spectrum is a series of radiation. The most energetic have the highest frequency and lowest wavelength. The visible light is part of the spectrum. It is the part of the spectrum that allows for sight.is the valency of carbon 2 or 4
Answer:
4
explanation:Carbon has four valence electrons and here a valence of carbon is four.
Answer:
4
Explanation:
needs four electrons to complete its orbit
An experiment was conducted to determine the density of a rock sample. The table shows a partial record of the experiment.
Experimental Record
Mass of Rock
86.59
Volume of Water in the Graduated Cylinder 142.5 mL
?
What information should be recorded in the last row of the table?
Answer: the density of the rock
55.91g/ml
Explanation:
The density of the rock after it had being placed in the cylinder of water so the calculation should look like this:
Volume of water substract the mass of the rock:
And that is 142.5 ml - 86.59g =
Answer 55.91 g/ml
So the density of the rock is 55.91g/ml
I need help please???
Answer:
the answer is the 2nd option
Explanation:
distance is divided by rime
Which best describes what is occurring when a door is almost closed and rays of light fan out from the small opening? absorption interference refraction diffraction
Answer:
The correct answer is Option D (diffraction).
Explanation:
Diffraction has been known as a mechanism through which light rays divide across clusters of darkness and light rather than into the colors of the rainbow. That is the twisting of such an obstacle across the sun. In this case, the challenge has been the door from which the illumination moves and bends.Other alternatives are not relevant to the specified case. So, the alternative above would be appropriate.
Answer: D
Diffraction
Explanation:
E D G E 2 0 2 0
Who is best associated with Psychoanalysis?
-Wilhelm Wundt
-Sigmund Freud
-William James
-None of the above
-Other:
Answer:
None of the above
Explanation:
Erikson's was a student of freud's and expanded of his theory of psychosexual development by emphasizing the importance of culture in parenting practices and motivations and adding three stages of adult development.
If 45.0 mL of a 4.00 M sodium sulfate (Na2SO4) solution is used for the reaction shown above, how many moles of sodium ions were present in solution before the reaction proceeded?
Answer:0.360
Explanation:
I had this on ck12 yesterday
The moles of sodium ions were present in the solution before the reaction proceeded is 0.36moles
Molarity of a solutionThe formula for calculating the molarity of a solution is expressed as:
Molarity = moles/volume
Given the following parameters
Molarity = 4.00M
Volume of sodium sulfate = 45mL = 0.045L
Substitute to have;
Molarity = 4 * 0,045
Molarity = 0.18
Since there are 2 atoms of sodium ion in the solution, hence the moles of sodium ions were present in the solution before the reaction proceeded is 0.36moles
Learn more on molarity here: https://brainly.com/question/17138838
What kind of reaction is KI(aq) +AgNO3(aq) --> AgI(s) + KNO3 (aq)
Answer:
A double-replacement reaction
Explanation:
you're welcome
Complete and balance each of the following equations for gas evolution reactions HCl(aq)+ZnS(s)>
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
1. give equation
aHCl(aq) + bZnS(s) ⇒ ZnCl₂(aq) + cH₂S(g)
2. make an equation
H, left=a, right=2c⇒a=2c(eq 1)
Cl, left=a, right=2⇒a=2⇒c=1(from eq 1)
Zn, left=b, right=1⇒b=1
So the equation :
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
Please answer it!! Would appreciate a lot!!
Answer:
1 acid
2 neutralization
3 H+ , OH-
4 metal
5 alkali
How many mL of ethanol would you
add to water to make 1750 mL of a
40.0% ethanol solution (v/v%)?
Answer:
700 mL of ethanol would be added
Explanation:
Given data:
Volume of ethanol added to make 40% v/v solution = ?
Total volume of solution = 1750 mL
Solution:
We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.
(40/100)× 1750 mL
0.4 × 1750 mL
700 mL
700 mL of ethanol would be added.
A steel cylinder with a moving piston on top is filled with helium (He) gas. The force that the piston exerts on the gas is constant, but the volume inside the cylinder doubles, pushing the piston up.
Which is the cause for the change?
A. The helium atoms increased in size.
B. The density of the helium atoms decreased.
C. The temperature increased.
D. The pressure decreased.
Answer: B. The density of the helium atoms decreased.
Explanation:
Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?
Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
Balance the following chemical equation
If I have 7 electrons, 7 protons, and 7 neutrons what is my mass?
Answer:
14. The protons and neutrons count, but the electrons do not.
Explanation:
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases
Show your calculation by uploading a picture. Calculate the molar mass of ammonia, NH3
Answer:
17.04 g/mol
Explanation:
Molar Mass of NH₃
we know that
Nitrogen has 14.01 gram/mol
And Hydrogen has 1.01 gram/mol
but we have 3 Hydrogens So we multiply
1.01 by 3 i.e., 3.03
Now, add
14.01
+ 3.03
17.04
So, The molar mass of ammonia, NH₃ is
17.04 g/mol
-TheUnknownScientist
what happens during chemical reactions?
Answer:
Energy is given off or absorbed.
Explanation:
A P E X
how does sustainable development support in a long term vision
Explanation:
meet .google .com/sxr-wgwg-vnc
